TO35 Fueling Issue Help Please

I am helping a friend get her TO35 running properly. It has the continental gasoline engine, and it appears to have a TSX carburetor. It starts when choke is pulled, but will only run when choke is held on, even when warmed up. It sat over the winter and the fuel sediment bowl had a lot of junk in it, and the air filter was filthy and full of sludge. Sea Foam did nothing. I cleaned the air filter, sediment bowl, and drained the carb bowl. It ran fine when I mowed with it over a year ago. A couple of other people have mowed with it since then but they didn't do any maintenance.

Does it sound like I need to remove and clean the carburetor completely?

Do you disconnect/reconnect the linkages with the carburetor unbolted? Access is limited.

How do you adjust the idle wingnut that is behind the carburetor? It it's cramped in there between the manifold, with the fuel line, air hose, plus the heat from the exhaust manifold.
 
Make sure the breather is clear before adjusting then try turning the main jet out so choking is unnecessary and yes the connections are made with the carb hanging loose.
 
(quoted from post at 05:47:28 07/07/19) Make sure the breather is clear before adjusting then try turning the main jet out so choking is unnecessary and yes the connections are made with the carb hanging loose.

Where is the breather on a TSX carb?
 
Pull the drain plug on the bottom of the carb, catch what comes out.

If nasty, the tank will need to come off and be rinsed out with E85.

Check the flow, should have a healthy stream, not a drip or stop completely. If not a good flow, check for restrictions back to the tank. There should also be a screen in the carb inlet elbow. If there is an inline filter, that can be the problem. They don't do well with gravity flow systems.

The carb may also be contaminated inside. Usually it can be removed, eased apart and cleaned without a kit, just be careful with the gasket. It is easier to disconnect the link from the governor arm than trying to work behind the carb.
 

When I drained the carb bowl, the fuel looked ok. I think I'm going to remove the carb and clean it.

Do the bolts typically get frozen? Should I use penetrating oil on them before I try to loosen them?

Does the power valve screw get richer when you turn out CCW, or in CW?
 

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